ADA4941-1: Single-Supply, Differential, 18-Bit ADC Driver Data Sheet (Rev. D)10/28/2005651 K
Features and Benefits
- Single-ended-to-differential converter
- Excellent linearity
- Distortion −110 dBc at 100 kHz for VO, dm = 2 V p-p
- Low noise: 10.2 nV/√Hz, output-referred, G = 2
- Extremely low power: 2.2 mA (3 V supply)
- High input impedance: 24 MΩ
- User-adjustable gain
- High speed: 31 MHz, −3 dB bandwidth (G = +2)
- Fast settling time: 300 ns to 0.005% for a 2 V step
- Low offset: 0.8 mV maximum, output-referred, G = 2
- Rail-to-rail output
- Disable feature
- Wide supply voltage range: 2.7 V to 12 V
- Available in space-saving, 3 mm × 3 mm LFCSP
The ADA4941-1 is a low power, low noise differential driver for analog-to-digital converters (ADCs) up to 18 bits in systems that are sensitive to power. The ADA4941-1 is configured in an easy-to-use, single-ended-to-differential configuration and requires no external components for a gain of 2 configuration. A resistive feedback network can be added to achieve gains greater than 2. The ADA4941-1 provides essential benefits, such as low distortion and high SNR that are required for driving high resolution ADCs.
With a wide input voltage range (0 V to 3.9 V on a single 5 V supply), rail-to-rail output, high input impedance, and a user-adjustable gain, the ADA4941-1 is designed to drive single-supply ADCs with differential inputs found in a variety of low power applications, including battery-operated devices and singlesupply data acquisition systems.
The ADA4941-1 is ideal for driving the 16-bit and 18-bit PulSAR® ADCs, such as the AD7687, AD7690, and AD7691. The ADA4941-1 is manufactured on Analog Devices, Inc., proprietary, second-generation, eXtra fast complementary bipolar (XFCB) process, which enables the amplifier to achieve 18-bit performance on low supply currents.
The ADA4941-1 is available in a small 8-lead LFCSP as well as a standard 8-lead SOIC and is rated to work over the extended industrial temperature range, −40°C to +125°C.
- Single-supply data acquisition systems
- Process control
- Battery-power systems
- Medical instrumentation
Markets and Technologies
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
The Universal Differential Amplifier Evaluation Boards can be used to evaluate single, high speed, fully differential amplifiers. The evaluation boards are bare boards that enable users to quickly prototype a variety of differential or single-ended circuits, which minimizes risk and reduces time to market. These boards are all RoHs Compliant. See references below on what board to order by lead count and package.
UG-888: Evaluation Board for Differential Amplifiers Offered in 8-Lead MSOP Packages (Rev. 0)382.52 K
UG-889: Evaluation Board for Single Differential Amplifiers Offered in 16-Lead LFCSP Packages (Rev. A)200.15 K
UG-474: Evaluation Board for Differential Amplifiers Offered in 8-Lead SOIC Packages263 kB
Documentation & Resources
UG-474: Evaluation Board for Differential Amplifiers Offered in 8-Lead SOIC Packages9/25/2012263 kB
MT-218: Multiple Feedback Band-Pass Design Example2/10/201290 K
SAR ADC & Driver Quick-Match Guide9/13/2013251 kB
Amplifiers for Video Distribution3/8/2008115 kB
High Speed Amplifiers Selection Table2/27/200877 kB
Tools & Simulations
Support & Discussions
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.